iOS面试题

iOS 属性修饰词 weak，assign，strong，copy

https://www.jianshu.com/p/ba5c1f5aba0c

iOS开发 生命周期

https://www.jianshu.com/p/4026cb07cda3

iOS 保持界面流畅的技巧

https://blog.ibireme.com/2015/11/12/smooth_user_interfaces_for_ios/